Detector for wireless signaling apparatus.



' M. B. JOHNSON. DETECTOR WIRELESS SIGNALING A ATUS.

APPLICATION FILED 00T.6, 191

,009,317, I Patnted Nov. 21, 1911.

WITNESSES INVENTOR 4 aw WQWWW ATTORNEY MAURICE BERNAYS JOHNSON, ,OF SAN ANTONIO, TEXAS.

n'n'rnc'ron ron WIRELESS SIGNALING APPARATUS.

Application filed October 6, 1 910. Serial N01 585,545.

To all whom it may concern:

Be it known that I, MAURICE, JOHNSON, a citizen of the United States,

and a resident of San Antonio, in the countyv of Bexar and State of Texas, have made and invented certain new and useful Improvements in Detectors for'Wireless Signaling Apparatus, of which the following is aspecification. V Y

My invention relates to animprovement in detectors, such, for instance, as are used or employed in wireless telegraphy or telephony, the object of the invention being to provide a device of thischaracter which shall be simple and-cheap to manufacture, efficient in use, and by means of which a fine and accurate adjustment of the parts may be secured and permanently retained.

A further object of the invention is to provide a detector which shall be universal in its application, that is, by means of which any of the well known minerals or materials may be employed and removably held in proper position, and with these and other ends inview the inventionconsists of oer-- tam novel features of construction and com binations of parts as will be hereinafter fully described and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in perspective of my improved detector. Fig.2 is a sectional view taken onthe line 2-2 of Fig. 1.

Referring. to the drawings, 5 represents the base, constructed of any desired size and shape, and of any insulating material, such as hard rubber, glass, etc. -To this base5 is clamped, or otherwise secured, the supporting plate or strip 6 made of brass or other desired material, and upon which is removably held the mineral 7, this element 7 comprising anyof the well known minerals used in detectors as'now commonly constructed, as for instance, silicon, carborundum, iron pyrites, etc. In order to retain this mineral in its proper position, I secure to the base plate 5, and also tothe supporting plate 6,

the spring 8, one end of which is tightly securedto the binding post 9, and the opposite end preferably curved and bearing upon the brass, copper, etc. also secured one end of the spring 10 by mineral 7, the said'spring 8 beingmade, of course, of a conducting metal, such as spring To the base plate 5 is means of the binding post 11, this spring acting as a conductor and provided at its free end with the lug or projection 12,

BERNAYS Specification of Letters Patent. Patented Nov. 21, 1911,

which, when said spring 10 is depressed, as

hereinafter described, contacts with the mineral 7. In order to adjust .or vary the conducting pressure. of the point or lug12 on the mineral 7, I secure to the base plate 5 the post or standards 13 connected by the cross-bar 14:, the'latter being provided with a sleeve'15 into which is threaded the ad: justing screw. 16, the lower. end of which bears upon the spring 10. o On this adjusting screw 16 is also threaded the lock-nut or lever 17, which, when turned inthe proper direction, tightly binds'upon the cross-bar l4- and securely holds the adjusting screw in its proper position and against any accidentalturning or rotation.

In practice, when it is desired to adjust the detector, that is, by varying the pressure of the spring or conductor 10 upon the min-' eral 7, it is simply necessary to turn the lever or lock-nut 17 in the proper direction, whereupon the adjusting screw 16 may be rotated to travel upwardly or downwardly and thereby vary the pressure of the lug or projection 12 on the mineral 7. When-the proper adjustment has been made, the locknut 17 is properly turned on the adjusting screw to bind or hold the same in its adjust-- ment and thereby avoid any Subsequent or accidental turning or rotation of the adjusting screw 16. v A

From the foregoing, it will be understood that my invention is exceedingly simple in construction, can be manufactured at a small cost, may be easily, readily and accurately adjusted, and adapted for use in connection with any of the minerals now commonly em ployed in this class or type of instruments.

What I claim is 1. A detector for use with wireless telev graph apparatus comprising a supporting base of non-conducting material; a metallic plate resting upon said base; a mineral substance resting upon said metallic plate; a leaf spring the free end of which is adapted to engage said mineral substance to thereby press it into contact with said plate and hold it in place; an element adapted to contact with said mineral substance; and a screw engaging said element and adapted to force the same into contact withsaid mineral substance, said mineral substance and the element which contacts therewith. being included in a circuit through which a current of electricity may flow. I

2. A detector of the character described comprising a base ,plate of non-conducting material, a metallic plate resting upon said base plate, a mineral substance resting upon said metallic plate, a spring secured in position upon said metallic plate and adapted to engage said mineral substanceto'hold it in 'place, a second spring, one end of which is secured to said base plate and'the other end of Which contacts with said mineral sub-o stance, a support independent of said second spring mounted on said base plate, and an adjusting screw carried by said support and the end of which engages said second spring, substantially as described.

Signed at NewrYork, borough of Manhat- 5 MAURI'OE- BERNAYS JOHNSON. -W1tnesses A. v. WALSQ, H. M. WHITE. v

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. a r v 

